“I will be challenging the validity of this decision because I believe it is inconsistent with the party’s own rules,” Husar told News Corp Australia on Friday.

Soon after she tweeted that she was “deeply disappointed” by the decision, adding that she was awaiting advice on the reasons for the decision and was considering her options.

The federal Labor leader, Bill Shorten, is of the view that Husar shouldn’t contest the next election in 2019.

Husar announced in August she would not run after allegations were levelled against her of bullying and sexual harassment.

Emma Husar MP 💪🏼 (@emmahusarmp)

Deeply disappointed that my endorsement for Lindsay has been withdrawn today by @NSWLabor. I have not been advised as to the reasons for, as set out in the Party rules. I’ll await this advice in the interests of procedural fairness and in the meantime I’ll consider my options.

Shorten said his view had not changed since the Lindsay MP announced she was quitting.

“I said at the time ... I thought that was the right decision then, both for her and the party,” he told reporters in Canberra on Friday. “I haven’t changed my mind.”

Husar is also gearing up for a defamation lawsuit against the media outlet that revealed the allegations made against her in a confidential Labor internal investigation which included evidence from more than 20 people.